Abstract: A low-pressure discharge lamp having a tubular glass lamp vessel 10, on an outer surface of which conductor layers are formed as electrodes 21 and 26. The ultrasonic solder dipping layers 31 and 36 are formed at both ends of the vessel 10 as conductor layers. The end surfaces of the glass lamp vessel are blasted and ultrasonic solder dipping layers are formed on the blasted surfaces 41 and 46 by ultrasonic solder dipping. Conductor layers forme external electrodes 21 and 26, which are in contact with the glass surface more strongly. A low-pressure discharge lamp having the conductor layers of a uniform thickness can be mass-produced at low cost.

Abstract: A method of this invention for forming electrical wiring paths on an insulative substrate by means of an electroplating only at necessary portions on the insulative substrate comprises steps of forming on the insulative substrate a plated metal foundation layer which comprises an extremely thin conductive metal layer, closely fitting onto this extremely thin layer a first mask member from which the necessary portions for forming the electrical wiring paths are removed and having a surface to which no plating is applicable, forming a first plated layer of such metal as copper on the extremely thin conductive metal layer over the first mask member, closely fitting onto the first plated layer a second mask member from which some but not all portion of the electrical wiring paths of the first mask member are removed, forming a second plated layer of a second metal on the second mask member, and removing the first and second mask members and thus exposed portions of the extremely thin conductive metal layer, where